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119 lines
2.5 KiB
C++
119 lines
2.5 KiB
C++
/*
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* CBinaryReader.cpp, part of VCMI engine
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*
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* Authors: listed in file AUTHORS in main folder
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*
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* License: GNU General Public License v2.0 or later
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* Full text of license available in license.txt file, in main folder
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*
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*/
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#include "StdInc.h"
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#include "CBinaryReader.h"
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#include "CInputStream.h"
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#include "../TextOperations.h"
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VCMI_LIB_NAMESPACE_BEGIN
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#ifdef VCMI_ENDIAN_BIG
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template <typename CData>
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CData readLE(CData data)
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{
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auto dataPtr = (char*)&data;
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std::reverse(dataPtr, dataPtr + sizeof(data));
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return data;
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}
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#else
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template <typename CData>
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CData readLE(CData data)
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{
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return data;
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}
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#endif
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CBinaryReader::CBinaryReader() : stream(nullptr)
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{
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}
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CBinaryReader::CBinaryReader(CInputStream * stream) : stream(stream)
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{
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}
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CInputStream * CBinaryReader::getStream()
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{
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return stream;
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}
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void CBinaryReader::setStream(CInputStream * stream)
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{
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this->stream = stream;
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}
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si64 CBinaryReader::read(ui8 * data, si64 size)
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{
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si64 bytesRead = stream->read(data, size);
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if(bytesRead != size)
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{
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throw std::runtime_error(getEndOfStreamExceptionMsg(static_cast<long>(size)));
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}
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return bytesRead;
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}
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template <typename CData>
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CData CBinaryReader::readInteger()
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{
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CData val;
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stream->read(reinterpret_cast<unsigned char *>(&val), sizeof(val));
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return readLE(val);
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}
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//FIXME: any way to do this without macro?
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#define INSTANTIATE(datatype, methodname) \
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datatype CBinaryReader::methodname() \
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{ return readInteger<datatype>(); }
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// While it is certanly possible to leave only template method
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// but typing template parameter every time can be annoying
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// and templates parameters can't be resolved by return type
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INSTANTIATE(ui8, readUInt8)
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INSTANTIATE(si8, readInt8)
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INSTANTIATE(ui16, readUInt16)
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INSTANTIATE(si16, readInt16)
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INSTANTIATE(ui32, readUInt32)
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INSTANTIATE(si32, readInt32)
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INSTANTIATE(ui64, readUInt64)
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INSTANTIATE(si64, readInt64)
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#undef INSTANTIATE
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std::string CBinaryReader::readBaseString()
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{
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unsigned int len = readUInt32();
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assert(len <= 500000); //not too long
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if (len > 0)
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{
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std::string ret;
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ret.resize(len);
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read(reinterpret_cast<ui8*>(&ret[0]), len);
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return ret;
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}
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return "";
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}
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void CBinaryReader::skip(int count)
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{
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stream->skip(count);
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}
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std::string CBinaryReader::getEndOfStreamExceptionMsg(long bytesToRead) const
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{
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std::stringstream ss;
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ss << "The end of the stream was reached unexpectedly. The stream has a length of " << stream->getSize() << " and the current reading position is "
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<< stream->tell() << ". The client wanted to read " << bytesToRead << " bytes.";
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return ss.str();
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}
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VCMI_LIB_NAMESPACE_END
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